344. 反转字符串

编写一个函数，其作用是将输入的字符串反转过来。输入字符串以字符数组 char[] 的形式给出。

不要给另外的数组分配额外的空间，你必须原地修改输入数组、使用 O(1) 的额外空间解决这一问题。

你可以假设数组中的所有字符都是 ASCII 码表中的可打印字符。

 

示例 1：

输入：["h","e","l","l","o"]
输出：["o","l","l","e","h"]
示例 2：

输入：["H","a","n","n","a","h"]
输出：["h","a","n","n","a","H"]

---

class Solution {
public:
    void reverseString(vector& s) {
        int n=s.size();
        int l=0;
        int r=n-1;
        while(l

---

class Solution {
public:
    void reverseString(vector& s) {
        int n = s.size();
        for (int i = 0; i < n/2; ++i) {
            swap(s[i], s[n-1-i]);
        }
    }
};

反转数组